Hi,
For showing image list or slider similar to .There is no need to write any code in NextGEN Gallery file.You can choose options during creation of page/post for that gallery page/post there you have to choose gallery option as imagebrowser.After selecting that option it will show the images as just like
For design purpose you can edit link Back in imagebrowser-caption.php or imagebrowser-exif.php files that is inside view folder.
Thanks